Comprehensive collection of questions from General Science asked in recent state service examinations. Each question is verified with official answer keys and step-by-step bilingual solutions.
The electrical conductivity of a semiconductor at absolute zero (0 Kelvin) temperature is:
The characteristic feature of a superconductor is:
Electrical conduction in a semiconductor occurs through:
On heating, the electrical resistance of a semiconductor:
The characteristic of the wire used in a fuse is:
Assertion (A): Lightning conductors protect buildings from destruction. Reason (R): They divert and conduct the electrical charge safely to the ground. Code:
A transformer is used for which of the following purposes?
Transformers are used for:
With reference to street lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees, but it is not so in the case of LED lamps. 2. As street lights, sodium lamps have a longer lifespan than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic, while LED lamps offer significant color advantages in street lighting. Select the correct answer using the code given below:
Which gas is filled in a fluorescent tube?
What is the order of magnitude of the electrical resistance of the human body (dry)?
The fuse wire used for household electrical safety is made of a metal having:
A choke is attached to a fluorescent tubelight. The choke coil:
Grounding (earthing) is used in electrical appliances for:
Alternating current is converted into direct current by:
Which of the following displays electricity consumption in ascending order?
The Earth's magnetic field is caused by:
Some devices and their associated energy conversions are given below: Device Energy Conversion (i) Electrical Generator Mechanical to Electrical (ii) Electrical Motor Electrical to Mechanical (iii) Diesel Engine Light to Electrical (iv) Solar Cell Chemical to Mechanical Which of the pairs given above is/are correctly matched?
In a three-pin electric plug, the longest pin should be connected to:
If the electric current flowing in a wire and the potential difference are both doubled, the electric power will:
Small identical droplets are charged to a potential $V$. If $n$ such droplets coalesce to form a single larger drop, the potential of this drop will be:
Assertion (A): In India, electricity distribution companies bill power consumption in kWh (kilowatt-hours). Reason (R): In India, the electric power distribution system operates at 60 Hz frequency.
Which gas is filled in a common fluorescent tubelight?
In domestic electrical supply, the wire with black insulation is:
Assertion (A): Light Emitting Diode (LED) lamps offer a longer lifespan compared to Compact Fluorescent Lamps (CFL). Reason (R): Light Emitting Diode (LED) lamps are more energy efficient than CFLs. Code: